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我目前正在嘗試解決與ideon項目歐拉問題7。我正在實施素數生成器。以下是我有:data.sequence中沒有EmptyL?
import Data.Sequence ((|>), empty, viewl, EmptyL, length, index)
isprime primes n = let
factors = viewl primes
inner EmptyL = True
inner (factor :< others) = if n `mod` factor == 0 then False else inner others
in inner primes
nextPrime primes = let
findPrime n = if isPrime primes n then n else findPrime (n + 1)
in primes |> (findPrime $ primes `index` (length primes + 1))
result = head $ foldr (.) id (replicate 1000 nextPrime) [2]
main = putStr $ show result
的問題是,ideone返回我一個編譯錯誤:prog.hs:1:42:模塊Data.Sequence' does not export
EmptyL」(見https://ideone.com/vlSNX#view_edit_box)。
我做錯了什麼,或者ideone有問題嗎?
謝謝。這確實解決了我的進口問題。儘管如此,我仍然有很多錯誤:-)。現在修復它們 – Simon